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[PATCH] proc: convert task_sig() to use lock_task_sighand() 

lock_task_sighand() can take ->siglock without holding tasklist_lock.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Oleg Nesterov 2006-10-02 02:18:52 -07:00 committed by Linus Torvalds
parent 7fbaac005c
commit 5e6b3f42ed
1 changed files with 5 additions and 6 deletions
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11
fs/proc/array.c
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@ -244,6 +244,7 @@ static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
static inline char * task_sig(struct task_struct *p, char *buffer)
{
unsigned long flags;
sigset_t pending, shpending, blocked, ignored, caught;
int num_threads = 0;
unsigned long qsize = 0;
@ -255,10 +256,8 @@ static inline char * task_sig(struct task_struct *p, char *buffer)
sigemptyset(&ignored);
sigemptyset(&caught);
/* Gather all the data with the appropriate locks held */
read_lock(&tasklist_lock);
if (p->sighand) {
spin_lock_irq(&p->sighand->siglock);
rcu_read_lock();
if (lock_task_sighand(p, &flags)) {
pending = p->pending.signal;
shpending = p->signal->shared_pending.signal;
blocked = p->blocked;
@ -266,9 +265,9 @@ static inline char * task_sig(struct task_struct *p, char *buffer)
num_threads = atomic_read(&p->signal->count);
qsize = atomic_read(&p->user->sigpending);
qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
spin_unlock_irq(&p->sighand->siglock);
unlock_task_sighand(p, &flags);
}
read_unlock(&tasklist_lock);
rcu_read_unlock();
buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim);